Respiratory mask



FIG. 1 is a front view of a respiratory mask.

FIG. 2 is a rear view of the respiratory mask shown in FIG. 1.

FIG. 3 is a left side view of the respiratory mask shown in FIG. 1.

FIG. 4 is a right side view of the respiratory mask shown in FIG. 1.

FIG. 5 is a top view of the respiratory mask shown in FIG. 1.

FIG. 6 is a bottom view of the respiratory mask shown in FIG. 1; and,

FIG. 7 is a front perspective view of the respiratory mask shown in FIG. 1. 

CLAIM The ornamental design for a respiratory mask, as shown and described. 